Modify Existing Product Assembly Animation (Blender)

We are looking for an experienced 3D technical animator to update an existing product assembly animation. The original animation is approximately 9 minutes long and was created in Blender. Around 4 minutes of the animation will remain unchanged, while approximately 5 minutes will need to be updated to reflect design changes and revised assembly steps. We will provide: Existing rendered MP4 of the assembly animation STEP files (or alternative CAD formats exported from SolidWorks if preferred) Detailed instructions identifying which assembly steps have changed Images and documentation where required Original Blender project files if we are able to obtain them Deliverables: Updated assembly animation Smooth transitions between existing and new sections Final edited MP4 1080p, 30fps What we're looking for: Strong experience producing technical or engineering assembly animations Experience importing and working with CAD data in Blender Ability to accurately animate mechanical assemblies and installation sequences Good communication and attention to detail In your proposal, please include: Examples of similar assembly or technical animations you've produced. Your proposed workflow for updating an existing animation where approximately half of the content can potentially be reused. Whether having the original Blender project files would significantly reduce the time and cost of the work, or whether you would approach the project differently if only the rendered video and CAD files are available. Your estimated cost and delivery time. We're looking for someone who can recommend the most efficient approach while maintaining a high-quality, professional result. There is potential for further product animation work in the future for the right freelancer.